August 2013: The girls of Ghostbar Vegas help Breaking Bad's RJ Mitte ring in 21 right. I like to think he used cheesy breakfast-related lines on all of them.

People are nervous about Miley Cyrus's 21st birthday. She turns the big two-one tomorrow, and reports on the festivities are already flying: There'll be penis lights! And a sex dungeon! And the early stages of the apocalypse! OK, if the sex dungeon thing comes to fruition, I'll stand corrected—but it sounds like Cyrus is simply planning on doing it up big for her 21st, which is a celebrity tradition as old as the hills. (And The Hills—I obviously wouldn't make this slideshow without LC's celebration.) From New York City to Vegas to Africa, here's how 21 of our favorite stars partied their way into legality.

Photos: Splash News, Fame/Flynet, Getty Images, Instagram

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Megan AngeloEntertainment writer. I love talking about TV so much, you'll eventually back slowly away from me at a party.